125 Amp Wire Size Aluminum
The national electrical code nec recommends a maximum voltage drop of 3 percent for individual household circuits known as branch circuits this is a good goal to shoot for when sizing the conductors for an underground cable the following are the maximum lengths of cable you can use while still maintaining a 3 percent voltage drop for the given wire size awg and.
125 amp wire size aluminum. A 3 0 aluminum conductor will limit the voltage drop to3 or less when supplying 125 amps for 175 feet on a 220 volt system. The figure we would plug into the calculator would be. The sub panel will be located one floor below the 200 amp main panel and need about 14 feet of wire for a neat installation.
Proper wire gauge recommendation for installation of 125 amp sub panel. I assume i need to run 4 wires 2 hot 1 neutral and 1 ground. 40 x 1 25 14 3 50 14 3 67 amps.
Single phase voltages are usually 115v or 120v while three phase voltages are typically 208v 230v or 480v. The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 volts 60 c through 90 c 140 f through 194 f not more than three current carrying conductors in raceway cable or earth directly buried based on ambient air temperature of 30 c 86 f. From table 430 150 they draw 40 amps 14 amps and 3 amps respectively.
Three pumps of a pump station 30 10 and 1 horsepower are connected to the power source of 460 volts 3 phase. Voltage enter the voltage at the source of the circuit. 60 c 140 f 75 c 167 f awg mm copper.
I understand i could use a 125 amp breaker but i do not need the additional amperage. What size aluminum wire needed for 125 amp service 120 feet underground in conduit 220 volt single phase. Sizing the conductors.
The tables below are intended to be a general guide for wire size and amp ratings. If the 125 amp load is a sub distribution panel that is not going to be. The run is no more than 100ft.
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